<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>jquery之dom操作</title>
</head>

<body>
  <div id="app"></div>
  <script src="https://cdn.bootcdn.net/ajax/libs/jquery/1.10.0/jquery.js"></script>
  <script>
    const str = '下午还敢睡觉吗1111111？'
    $('#app').html(str)
  </script>
</body>

</html>